Hello Bill,
Nice to hear from you again. Indeed it's a good point, if the GPS isn't
only used for frequency calibration but also for absolute timing.
I looked at Paul Nicholson's principle of centroid calculation (to find
the "center" of a very short sync pulse) in vlfrx-tools/vttime.c, and
guess it's be applicable if we rely on the soundcard's "built-in"
lowpass filter. Will be implemented in SL today since I'm on holiday
now, and wx is poor..
73,
Wolf .
p.s. to Markus - the new version is uploaded to qsl.net, SL V2.91 b02 .
The centroid calculation for the GPS sync pulse will be added in the
next build.
Am 25.10.2016 um 14:10 schrieb Bill de Carle:
Watch out for another possible ambiguity: how are you going to ensure
the rising edge of the divider's 1-Hz output pulse is synchronized
with the start of a UTC second?
Bill VE2IQ
At 03:13 AM 10/25/2016, Chris 2E0ILY wrote:
Hello Wolfgang,
Monday, October 24, 2016
Probably a naive question, but I have a divider board connected to my
Trimble Thunderbolt 10MHz output, details in this link to a PDF:
http://www.perdrix.co.uk/FrequencyDivider/Frequency%20Divider%202.1.pdf
Is it possible to use the 1Hz output from the divider instead of
widening the 1PPS output? Thanks.
Best regards,
Chris 2E0ILY mailto:[email protected]
> Hello Jim,
> I still wonder why the sync pulses from the Thunderbolt E are so
> short - you mentioned 10 us in your email, but what is the exact
> pulse length ? With a slightly modified software (SL) it may be
> possible to use them as they are.. if they are longer than a
sample from the soundcard.
> 73,
> Wolf DL4YHF
> (not QRV on LF+MF unfortunately..)
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